Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.
March 3, 2009
Sergei Tschachotin: Die Statocyste der Heteropoden. Heidelberg, Univ., Diss., 1908 (Zeitschrift f. wissenschaftl. Zoologie; Bd. 90 ; S. 343-422)
This book is copyrighted because is author Sergei Stepanowitsch Tschachotin (* 13. September 1883 - † 24. Decemeber 1973) died in 1973.
The book is good but there are not quality images in this scan. The scan of this book by Google is very bad.